Generalize chime eigen-calibration to arbitrary driftscan telescopes

[ssiegelx]

• Move tasks from ch_pipeline.analysis.calibration to draco.analysis.calibration:
  • DetermineSourceTransit
  • TransitFit
  • GainFromTransitFit
  • FlagAmplitude
• Update tasks to obtain feed information (polarisation and position) from a telescope instance that is provided during setup instead of an input map.
• Update tasks to use telescope instance for ephemeris calculations instead of ch_util.ephemeris.
• Create EigenContainer with the the equivalent of the evec, eval, and erms datasets from the chime real-time pipeline. Create a subclass of TimeStream and EigenContainer that can replicate the chimecal acquisitions.
• Write new task that performs eigendecomposition of N2 visibility matrix and populates an EigenContainer.
• Remove dependence on ch_util modules. We will need to decide where to put these:
  • fluxcat
  • cal_utils